There is no doubt that Hangzhou is the most difficult place for mathematics, but it is difficult to talk about science. In fact, Hangzhou and Ningbo will be a little more difficult, but the quality is still good. Simple papers like Wenzhou and Taizhou are more basic, but high marks will be more difficult because the marking will be very strict. If you usually do problems, I suggest you choose some papers from northern Zhejiang, which is very beneficial. Of course, it all depends on the situation in your area.